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Old 31st July 2011, 10:32 PM   #1
Rozza is offline Rozza  Australia
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Question Advice for Repairing Alpine MRV 1507

Hi, After having issues with the protection light coming on and large current draw when sitting powered up on a bench with nothing connected to the output i have replaced all of the output transistors and i now have another issue...

when the amp is powered up all of the three led's are flashing different colours and then every 5 seconds there is a kind of power dip and a strange high pitched noise similar to a tropical insect coming from a component around the area of one the large transformer coils for a few seconds and then it will stop and the cycle starts again

just wondering what i should start with next, the capacitors in the area dont look inflated or to be leaking but i ws thinking of desoldering and testing these next

any advice appreciated, cheers
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Old 1st August 2011, 01:10 AM   #2
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Did you re-adjust the bias in the audio section after replacing the outputs?

Don't do anything with the capacitors.
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Old 1st August 2011, 03:35 AM   #3
Rozza is offline Rozza  Australia
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Hi, all I've done so far is replace the transistors and power up the unit for a minute
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Old 1st August 2011, 04:28 AM   #4
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The bias may be too high for the new transistors. Re-adjust it and see if that helps.
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Old 1st August 2011, 11:50 AM   #5
Rozza is offline Rozza  Australia
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ok cheers i'll give that a go, would the procedure for doing this be in the service manual as im having trouble trying to find one to download,

my email adress is gtfalcon351 (a t) hotmail (d o t) com if anyone has one to share thanks
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Old 1st August 2011, 11:54 AM   #6
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It's in the service manual. Email me if you want it.
babin_perry@yahoo.com

The procedure is essentially as shown in the following interactive demo.
http://www.bcae1.com/temp/ausettingbias.swf
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